It has always been difficult to transport fast logic signals long distances over copper conductors. Coaxial or twisted-pair transmission lines introduce attenuation, dispersion, ground loops, and provide an entrance point for external electrical noise. The result can be jitter, pulse width distortion, and ultimately logic errors.
The J720 is a compact signal-powered electrical-to-optical converter.
When used with a J730, the combination can transport logic level or critical timing triggers over kilometer distances in high EMI environments with link jitter typically below 10 picoseconds RMS. The J730 provides a digital logic output with risetime below 750 picoseconds, and a fast analog (180 MHz bandwidth) output is also provided for monitoring link integrity.
The J720 is compatible with the Highland model P400 Digital Delay/Pulse Generator and the company's VME-packaged electrical/optical converter products.
The J720 is also an excellent driver for the T760 dual-channel, 100-volt optical-to-electrical converter.
|FUNCTION||Single-channel logic-level electrical-to-optical converter|
|INPUT|| Nom 0 to +5 volts from 50 ohm source, +5.5 volts maximum
Input impedance 50 Ω nominal
|PROPAGATION DELAY||1 ns nominal, 50% electrical to 50% optical levels|
|OUTPUT|| 1.5 mW nominal optical power, driven from 5 volt, 50 Ω source
850 or 1310 nm wavelength versions available
See manual section 7
|BANDWIDTH||500 MHz min|
|OPTICAL RISETIME||< 300 ps driven by Highland P400 or equivalent|
|JITTER||< 12 ps RMS, J720 + J730 combination|
|OPERATING TEMPERATURE||0 to 60°C|
|CALIBRATION INTERVAL||Two years|
|CONNECTORS|| BNC electrical input jack
ST or FC optical fiber output
|PACKAGING|| Aluminum enclosure
0.75” (19.1 mm) width x 0.62” (15.7 mm) height x 3.35” (85.1 mm) nom
J720-1: 850 nm single-channel compact electrical-to-fiberoptic converter with ST connectorization
J720-3: 1310 nm single-channel compact electrical-to-fiberoptic converter with ST connectorization
J720-11: 850 nm single-channel compact electrical-to-fiberoptic converter with FC connectorization
J720-13: 1310 nm single-channel compact electrical-to-fiberoptic converter with FC connectorization